Air
purification activated carbon is a kind of activated carbon, the use of
high-quality activated carbon specially treated for the special
purification of contaminated air, so called air purification activated
carbon. Only the hardness, high strength, porous pores of activated carbon as air purification activated carbon
Activated
carbon is a carbonaceous material with relatively high carbon content
and relatively developed voids, such as coal, shell, wood, bone,
petroleum residue and other raw materials, after carbonization, and then
through 800 to 1500 degrees of activation of high temperature, the
formation of micro Hole and the hole, so that its specific surface area and adsorption capacity to meet certain requirements. Ordinary activated carbon production is generally divided into two processes, the first: carbonization, the second: activation. Activated carbon is divided into decolorization of activated carbon,
water purification activated carbon, air purification activated carbon,
heavy metal recovery of activated carbon hundreds of species, use and
its wide range of science is currently the most effective adsorption
material.
l
Air
purification activated carbon, the choice of high quality wood or
coconut shell, through the depth of activation and unique pore size
adjustment process, the activated carbon has rich pores, and the size of
the hole is slightly larger than the toxic gases, specific surface
area> 1300 m2 / g, benzene, Formaldehyde,
ammonia and other toxic and harmful gases with high efficiency
adsorption capacity, which can effectively remove indoor air of gaseous
pollutants and harmful malodorous substances, so as to achieve the
purpose of reducing pollution and purifying the air. Now
Division I introduced spherical and column-shaped products according to
different applications, so easy to desorption regeneration, low loss,
compared with the traditional particles or powdered activated carbon has
a higher life, can greatly reduce the cost of users. Therefore, whether in terms of efficiency or consumer perspective, activated carbon are all the best air purification filter.
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Activated carbon can be used as air purification carbon. Shell charcoal, coal can be used as raw materials for air purification of carbon. Coconut shell activated carbon which best.
Diagnosis and Prevention of Crop Calcium Deficiency
Symptoms are generally expressed as growth points: apical and terminal bud growth stagnation, apical necrosis, and root hair distortion; young leaves chlorosis, deformation, often with hook-like shape, leaf shrinkage, leaf margin curling, yellowing. The top of the stem of the soybean is curled in a hook shape; the leaves of the peanut are brown withered and dead patches; there are many empty pods, the grain is not full, the broad bean pods are deformed, and the atrophy is black; the pea pods are withered and the tendrils are atrophic; the potato is easy to be deformed and forms a string Tuber; tomato emergence of umbilical rot, also known as umbilical rot fruit, fruit early enlargement, the fruit of the top umbilical pulp water-like necrosis, after the disease tissue collapse, blackening, shrinkage, subsidence; cabbage edge rot, leaf The edge of the leaf blade in the water is immersed into brownish necrosis, and it looks like tofu skin when dry, also known as dry heartburn, dry edge, internal top burning disease, etc.; apple fruit suffers from plunging disease, also known as bitter pimples, with sunken spots on the surface of the fruit. The pulp tissue becomes soft and bitter. Apple water heart disease also caused by calcium deficiency, the pulp was translucent water stains, radially outward from the center of the expansion, the final fruit cell gap filled with sap and cause internal rot; pears lack of calcium, the skin appeared with spots, the heart of the fruit yellow ( Or rust). Environmental conditions that are prone to occur (1) Acid soils with low calcium content and exchangeable calcium, such as granite, phyllite, siltation, and peat soil. (2) Saline-alkaline earth with high sodium substitution, inhibits the absorption of calcium due to high salt concentration. (3) A large number of salt fertilizers (chemical nitrogen fertilizer and potassium fertilizer) are applied, and calcium deficiency is caused by high temperature and dry weather, dry soil and concentration of salt. (4) Plant crops that are sensitive to calcium deficiency such as alfalfa, tomato, Chinese cabbage, beets, soybeans, potatoes and strawberries, and apples. Diagnosis 1, morphology diagnosis of calcium deficiency symptoms as above. However, calcium deficiency and boron deficiency have similar symptoms, such as growth points, terminal buds and root tip withering, death, tender shoots, new leaf distortion, deformation, etc., easy to confuse, we must pay attention to identify, but the lack of boron leaves, petiole change Thick, thick, brittle, often brown material inside, but no calcium deficiency symptoms. 2, plant analysis and diagnosis of plant differences in calcium is quite large, the general dicotyledons such as Cruciferae, legume and other content is significantly higher than the monocotyledonous gramineous plants. The critical value or critical range of calcium deficiency in several crops is as follows: wheat seedlings <0.14%, potato leaf <0.49%, tomato seedlings <0.79%-1.5%, cucumbers (leaves and stems) <2.0%, cabbage, cabbage <1.8% , Apple (leaf) 0.5% -1.4%, citrus (leaf) 0.7% -20% peach (leaf) 0.8% -2.1%, grape (leaf) 0.4% -1.75%. 3, soil diagnosis Southern leaching strong acidic low-alkali soil is easy to calcium deficiency. It is generally believed that when substitutional calcium is less than 5-6 mg/100 g soil, crops may lack calcium; in calcium soils, calcium deficiency often occurs, which is caused by excessive concentration of soil salts and inhibition of calcium absorption. Therefore, in soil diagnosis, we should pay attention to the detection of salt concentration, and make a judgment based on the comprehensive analysis of plant calcium status. Prevention 1, the application of calcium fertilizer acidic soil calcium deficiency, lime can be used to provide calcium nutrition, but also in the soil acidity. For neutral and alkaline soils, in view of the reasons for the root absorption is blocked, the soil is ineffective, should be used for foliar spray, generally 0.3% -0.5% (0.7% of cabbage useful 0.7%) calcium chloride solution, even spray Several times. In addition, for the tomato umbilical rot, Japanese green wood test silicic acid was used for prevention and treatment, and the silicon and calcium contents of silicon plants were significantly increased. 2. Control of fertilizer use A large number of nitrogen and potassium fertilizers are used to increase the soil solution concentration and inhibit the absorption of calcium. This is especially true for ammonium nitrogen fertilizers. Controlling fertilizers and preventing the increase of salt concentrations are the basic measures for preventing calcium deficiency. 3, to prevent soil drying High-temperature drought, soil solution concentration, especially when the crop needs more calcium, such as the Chinese cabbage cabbage period, the tomato fruit period, etc., in case of drought can easily induce calcium deficiency, should be timely irrigation.